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A free, fast open-source image viewer across platforms.
- Views common image formats alongside complex files including RAW photos and Photoshop PSD documents. - Synchronizes multiple image viewer windows to compare small visual differences across frames simultaneously. - Performs basic editing tasks such as cropping, resizing, rotating, and adjusting color exposure or saturation. - Displays customizable floating widgets for file metadata, thumbnails, and color histograms.
Distributed freely under the GNU General Public License v3 with complete open-source transparency. Optimized for speed to open large RAW files without lagging or introducing system bloat. Offers multi-platform support across Windows, macOS, and Linux distributions. Includes unique side-by-side viewer synchronization making visual comparison effortless for professionals.
Category: Design & Creative
Team Size: 2-10
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Nomacs is a lightweight, open-source image viewer designed to handle standard graphic files as well as RAW and PSD formats seamlessly. It features semi-transparent widgets that display thumbnails, file metadata, and histograms directly alongside active canvases. Users can synchronize multiple instances to compare pictures side by side, make basic adjustments, and crop or resize images efficiently.
Nomacs was originally created in 2011 by Markus Diem, Stefan Fiel, and Florian Kleber as a fast, multi-platform image viewing utility. Developed out of a shared need for a lightweight tool capable of synchronizing multiple image frames, the project evolved into a robust open-source staple supported by global contributors.
